Oil filter



L. M. MONROE July 2, 1935 OIL FILTER Filed Aug. 12, 1932 ATTORNEYS closure 12. The cleaner bar 5 extends into these grooves with end parts l9 running therealong up to the closure. A second cleaner bar 5a having cleaner disks 6a thereon may be arranged between the parts I9 as indicated Figs. 1, 2 and 6. By this arrangement the cleaner is removable with the carrier as a unit, upon removal of the closure l2; and when the parts are assembled as illustrated, the cleaner is secured in the casing. Preferably the grooves i8 extend slightly longer than the cleaner end parts I9 allowing the latter limited movement longitudinally of the casing.

A compression spring 29 is arranged about the post l5 to bear between the lower carrier head 4 and a web 2| in the casing, the web havingan enlarged opening 22 which allows free flow of liquid while the web forms an abutment for the spring. The spring is of suiiicient strength to urge thevcarrier upwardly toward the inlet end of the casing until its motion limited by the cleaner bar 5 The parts are so p'oportioned and arranged that under certain pressure conditions at the inlet end of the casing the carrier Willbe lowered, against the action of the spring 20 until the cleaner bar 5a is, engaged by the upper head of the carrier, as indicated Fig. 6.

The casing is provided with a bypass clearance 23 ada ted to become operative as indicated Fig. 6, when the carrier is lowered to this extreme p iti n.

Operation will be as follows, assuming the parts as indicated Figs. 1 and 2, the casing being mounted vertically disposed as shown, as by brackets 24 and liquid entering through the inlet connection IO. Flow will be downwardly first through the openings l3. opening I3 directsfiowing liquid toward the sump l6 or onto the masses [1 whereentrained solid particles are removed, first adhering to the masses I1 and ultimately settling into the sump.

I6 therebelow. Liquid flowing through the oblique openings I3 is directed against and along the elements I of the near filter screen unit, that is or the near row of elements, tending to wipe them free of accumulations. The liquid passes through the clearances 3 of the near screen,

the screen removing entrained solid particles which cannot pass through the minute clearance openings3.

these being substantially filled by the parts l9, Similarly because of the frame. parts 1 overlying these grooves and fitting the 01' the cleaner.

bore 9 of the casing, all flow transverse of the screens must be by way of the openings 3 therein. Ultimately foreign matter will accumulate upon the first filter screen tending to close its open' ings -3. This will result in increased resistance to flow. As soon as this resistance becomes great enough to overcome the action of the spring 20, by the preponderance ofpressure above abutments 4 over the pressure below the abutments;

the carrier will be moved downwardly as apressure responsive plunger until the cleaner bar 5 reaches the lower ends of the grooves 18, the

cleaner moving with the carrier to this extent; Thereupon the cleaner will be fixed but the car- .rier may continue downwardlygthe cleaner mo- The central alignedv From the first screen the liquid flows through the second screen immediately theree behind and into the chmnber 25 back ofthe 7 tion terminatingwith a bump or jar as its limit screens, thus cleaned, is reduced to a normal amount, the pressure above the carrier will be correspondingly reduced and the spring 25! will return the carrier to its original shown position. This cleaning action obviously takes place entirely automatically.

Should the cleaning action for any reason fail to take place, the carrier will continue downwardly until attaining the position of Fig. 6, in which the upper head 4 of the carrier moves opposite the bypass clearance Thereupon the filter screens are bypassed, flow being had by way of the bypass 23 and openings i4. Thus if the filter be employed a lubricating system, lubrication will not fail even though the straining of the lubricant might be temporarily interrupted.

What I claim is: 1

1. Filter means of the class described comprismg a plurality of rod elements arranged in spaced parallel relation to form a pair of spaced screen units each comprising a row of rod elements with filtering clearances therebetween, and cleaning meansfor said clearances and comprising 'a bar arranged between said screen units transversely of the rods thereof and a plurality of cleaning members each mounted'on said bar and extending into an adjacent pair of said clearances, one of each screen element, said bar and screen units being mounted, for relative movement lengthwise of said rod elements to move said cleaning members along their clearances.

2. Filtering means of the class described comprising a casing having a cavity with connections for flow therethrough of liquid to be filtered, a filter screen unit'and a carrier therefor, said carrier being arranged in said cavity to dispose said filter screen in the path of said flow and being arranged for movement in one direction in said cavity dependent upon increased resistance of said filter unit to said flow, means for returning said carrier in the opposite direction when said resistance decreases, and cleaning means for said unit,.said cleaning means being operable by said movement.

3. Filtering means of the class described comprising a casinghaving a, cavity with connections for flow therethrough of liquid to be filtered, a

filter screen unit and a carrier therefon said carrier being arranged in said cavity to dispose saic I filter screen in the path of said fiow and being arr'angedfor movement in said cavity dependent 4. Filtering means of the class described comprising a casing having a cavity with connections for flow therethrough of liquid to be filtered, a I

filter screen unit comprising a plurality of rod elements arranged in. spaced parallel relation with filtering clearances therebetween, a carrier for said unit arranged in said cavity to dispose said filter screen in the path of said flow and being arranged for movement in said cavity dependent upon resistance of said'filter unit to said flow, said movement being the direction of saidrod elements, cleaning means for saidclearances andacomprising' a bar arranged transversely of said; rods and ,having a ,plurality of cleaning members, extending into saidclearances,

said bar being secured with said casing to have relative movement lengthwise of said cleaning membersdependent upon said carrier-movement. -5. Filtering means of the class described comprising a casing having a cavity with connections.

for fiow therethroughof liquid to be filtered, a filter screen unit, a carrier for said unit arranged in said cavity to dispose said filter screen in the said carrier, cleaning means for said screen unit and including a bar permanently associated with said screen unit and having ends extending beyond said carrier, said casing having slots to receive said bar ends and leading from said closure to permit insertion and removal of said cleaning means together with said carrier, said mid-region, said screen dividing the space beitween said members'into chambers on opposite bar ends extending in saidslots to bear uponsaid closure and thereby secure said cleaning means against said movement of said carrier. p

,6; Filtering means of the class described comprising a casing'havinga cavity'with connections for fiow therethrough of liquid to be filtered, a filter screen unit and a carrier therefor, said carrier being arranged in said cavity to dispose said filter screenin the path of said flow'and being arranged for movement within predetermined limits in said cavity dependent upon resistance of said filter unit to said flow, resilient means arranged to oppose said movement, cleaningmeans for said unit operable by said movement,

and 'means for bypassing said filter unit when said carrier approaches one of said limits.

7. Filtering means of the class described, comprising acasing having a cavity with connections for flow therethrough of liquid to be filtered, a filter screen unit disposed in said cavity in the path of said flow, said unit being supported for movement relative to said cavity, said movement in one direction being initiated by increased resistance of said unit to said flow, means for re-' turning said unit in the opposite direction, and cleaning means for said unit, said cleaning means being operable by said movement. i

8. Filtering means of the class described, comprising a casing member having a cavity with connections for flow therethrough of liquid to be filtered, a filter screen unit comprising ,a plurality of rod elements arranged in spaced parallel relation with filtering clearances'therebetween, a carrier member supported for movement relative to said casing member, said movement being dependent upon the resistance of said filter unit to said flow, said relative movement in one direc tion being caused by'increased resistance of said unit, means "for causing relative movement in the opposite direction upon decreased resistance of said unit, said movement being in the direction of said rod elements, cleaning elements adapted to extend into said clearances, said cleaning elements being supported by one of said members and said filter unit being supported by the other of saidmembers.

9. Filtering means of the class described, comprising a casing having a cavity with connections for flow therethrough of liquid to be filtered, a filter screen unit comprising a plurality of rod elements arranged in spaced parallel relation with filtering clearances therebetween, a carrier carrierbeing arranged'for movement in one direction in saidcavitydependent upon increased res'istance of said filter unit to said flow, means for movingsaidcarrier in the opposite direction upon,

decreased resistance of said unit, said-movement being in the direction of said rod elements, cleaningmeans forsaid clearances comprising-amurality of bars arranged transversely of said rods, said bars supporting a plurality of cleaning memhers extending into said clearances, said bars being secured to said casing; one of said bars limiting the carrier movement in one direction and the other of, said bars limiting the carrier movement in the other direction. r Filtering means of the class described, comprising a casing having connections for fiow therethrough of liquid to be filtered, a carrier comprising spaced members extending transversely of the casing and movable as pistons therealong, a filterscreen extending'longitudinally of the casing and supported between the members at their sides-of the screen, there being an opening through one member communicating with the chamber on one side. of said screen, there being an opening through theother member communi- 'cating withthe'chamber on the opposite side of said. screen, whereby the flow of the liquid is caused to passfthrough said screen and clogging of the screen causes movement of the carrier in one direction, means for returning the carrier in the opposite direction, and cleaning means for said-filter arranged to be made efiective-by said carrier movement. g

11. Filtering means of the class describedcom prising, a casing having a cavity with inlet and outlet connections for flow therethrough of liquid to be filtered, a filter screen disposed in said cavity in the path of said flow, a movable abutment having opposed faces only one of which is normally exposed to pressure from outlet-connections for flow therethrough of liquid to be filtered, a filter screen disposed in said cavityv in the path of said fiow, a movable abutment having opposed faces only one of which is normally exposed to pressure from said inlet, the other face being normally subjected to a slightly lower pressure whereby said abutment is moved in one direction when clogging of the screen increases said inlet pressure, means biasingsaid abutment in the opposite direction inclependent of said pressures, cleaning means for said screen operable by movement of saidabutment, a by-pass between said inlet and outlet connections, and means for opening said bypass when said cleaning means reaches a predetermined limit, r

13. Filtering means of the class described comprising, a casing having a cavity with inlet and outlet connections for fiow therethrough of liquid to be filtered, a filterscreen disposed in said cavity in the path of said flow, a movable abutment having opposed faces only one of which is normally exposed to pressure from said inlet, the other face being normally subjected to a slightly lower pressure whereby said abutment is moved in one direction when partial clogging of the screen increases said inlet pressure, means biasing said abutment in the opposite direction independent of said pressures,

cleaning means for said screen, operable by movement of said abutment, a bypass between said inlet and outlet connections, and means for opening said by-pass upon substantially ccmplete clogging of said screen.

14. Filtering means of the classdescribed comprising, a casing having a cavity with inlet and outlet connections for flow therethrough of liquid to-be filtered, a filter screen disposed in said cavity in the path of said flow, a movable abutment having opposed faces only one of which is normally exposed to pressure from said inlet, the other face being normally subjected to a slightly lower pressure whereby said abutment is 7 moved in one direction when clogging of the screen increases said inlet pressure, means biasing said abutment in the opposite direction independent of said pressures, and cleaning means 'zfor said screen operable by movement of said abutment, said abutment being arranged for sufficient movement in one directionto cause said cleaning means to traverse substantially the entire filtering surface of said screen.

15. A device for the purpose described comprising a casing having connections for flow therethrough of liquid to be filtered, a filter unit having parallel filtering elements arranged within said casing in the path of said flow, a cleaning unit for said filter unit having cleaning elements extending between said filtering elements, plunger means mounted for movement responsive to relative pressures on opposite sides of said .filter unit, and means connecting said plunger with one of said units to provide cleaning actuation of the latter relative to the other unit. I

16. A device for the purpose described com a connecting said other unit with said casing.

@ 17, A device for the purpose described comprising a casing having connections for flow therethrough of liquid to be filtered, a filter unit having parallel filtering elements arranged with in said casing in the path of saidfiow, a cleaning unit for said filter unit having cleaning elements extending between said filtering elements,

plunger means mounted for movement in the direction of said filtering elements responsive to relative pressures on opposite sides of said filter unit, one of said unitsbeing mounted upon said plunger whereby the latter'may act as a carrier thereof, and means securing the other unit with said casing.

- v LEO M. MONROE. 

